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Publication Detail
ON THE PARTICLE SIZE DISTRIBUTION OF A BASALTIC TILL
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Altuhafi F, Baudet BA, Sammonds P
  • Publisher:
    JAPANESE GEOTECHNICAL SOC
  • Publication date:
    02/2011
  • Pagination:
    113, 121
  • Journal:
    SOILS FOUND
  • Volume:
    51
  • Issue:
    1
  • Print ISSN:
    0038-0806
  • Language:
    EN
  • Keywords:
    glacial soils, laboratory tests, particle breakage, soil classification, SUBGLACIAL TILL, TRANSITIONAL BEHAVIOR, SEDIMENT DEFORMATION, CRITICAL-STATE, GLACIER, SOIL, MECHANICS, SHEARING, BENEATH, SANDS
  • Addresses:
    Altuhafi, F
    Univ London Imperial Coll Sci Technol & Med
    London
    SW7 2AZ
    England
Abstract
Stress and strain history play a major role in defining the final grading of a soil, and by studying how the particle size distribution of a soil evolves with stress and strain it may be possible to highlight some important aspects of the sediment past history. In this paper, the characteristics and evolution of the grading of a till from Iceland, so-called Langjokull sediment, are examined. Specimens of the till were tested in compression (triaxial, oedometer tests) to very high pressures, and in shearing (triaxial, ring shear tests) to very high strains. The change in grading corresponding to particle breakage during compression and shearing was monitored using sieve analysis and scanning electron microscopy. The results show that the particle size distribution of the till, which is well graded, does not evolve when the till is subjected to high stresses or strains. Additional tests on specimens made of the larger-sized till particles did however show signs of breakage during testing. This suggests that the current natural grading of the till was achieved by incessant shearing during its past history, and corresponds to an ultimate, "critical" grading. This is confirmed by the mineralogical analysis of the sediment, which highlights a single parent rock and weathering of the particles by mechanical processes only.
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Dept of Civil, Environ & Geomatic Eng
Dept of Earth Sciences
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